The air injection idea--neat.  Any idea how much it might have improved BSFC?

I'm sure this has been discussed, but, in theory, is there a way to make the trailing plug do more work in the event of failure of the leading plug?  For example, if we advanced the timing on the trailing plug a little, might it burn a higher percentage of the available charge?  This might be too hard to actually implement, but since we've got two plugs there anyway, it's tempting to try to find a way to make use of the second one when we might need it most.

Mark W.

Well at the time those unburned hydrocarbons were being swept
out the exhaust to be burned in the exhaust manifold. At
the time it was called a thermal reactor. If they could
be burned in the combustion chamber that would generate
more power for the same fuel improving the BSFC.

Well Mazda added a third plug higher than the one in there
now on the Le Mans engines and improved the BSFC a couple
of points.

http://www.rotaryeng.net/Mazda_R26B_US.pdf

Paul Lamar